Typhoon Sanvu (Huaning) formed as a tropical depression on the morning of August 10 at 0000 UTC (0800 PHT) 320 nautical miles east-northeast of Borongan on Samar Island inside the Philippine area of responsibility. PAGASA assigns names to Tropical Depressions because they often bring heavy rains and mudslides to the Philippines. Storm was named Tropical Depression Huaning for Philippine warnings but within 24 hours received the more recognized name Sanvu when it became a Tropical Storm. Sanvu is a Chinese name for coral. Tropical Storm Sanvu (Huaning) passed over a peninsula in Cagayan province on the island of Luzon early on the morning of August 12. It was upgraded to a typhoon before making landfall in China the next day on August 13. Sanvu (Huaning) rapidly dissipated after moving inland on August 14.

Sanvu was the first typhoon that necessitated a tropical cyclone signal for Hong Kong.